The social-media giant collects intensely personal information from many popular smartphone apps just seconds after users enter it, even if the user has no connection to Facebook, according to testing done by The Wall Street Journal. The apps often send the data without any prominent or specific disclosure, the testing showed.

Millions of smartphone users confess their most intimate secrets to apps, including personal health information. Unbeknown to most people, in many cases that data is being shared with someone else: Facebook.